Test MP+o-mb-o+o-addr-o

LISA MP+o-mb-o+o-addr-o
{
a = 1;
b = 42;
x = b;
0:r0 = a;
}
 P0              | P1             ;
 w[once] a 3     | r[once] r1 x   ;
 f[mb]           |                ;
 w[once] x r0    | r[once] r2 r1  ;
Observed
    1:r2=1; 1:r1=a;